minor css and js improvements

pub/src/js/sentri/response.js

@@ -3,7 +3,8 @@ document.addEventListener("DOMContentLoaded", async function () {
         const response = await fetch("/api/v1/frontend/response/");
 
         if (!response.ok) {
-            throw new Error(`HTTP ${response.status}`);
+            console.error(`HTTP ${response.status}`);
+            return;
         }
 
         const data = await response.json();